I used to have a some similar issues to yours, and turned out, it was my router was thinking that I was getting DDOSed every time I tried to ping or join a server.
After raging for a few days being not able to play anything, or connect anywhere, I went into the router settings, and found a setting which was something related to "Flood", unticked it, and after restarting the router, everything started working again.

Minimal FluxHUD, finally ready!
I will update it in case updates break it, but I won't be doing any big changes to it anymore.

BIG THANK YOUS:
Flux for letting me use his HUD as the basis for my version.
Donttouchmyfrog for helping me A LOT with HUDs.
Zetorri for testing and reporting bugs and bad design.
People for actually using it!

SCREENIES

DOWNLOAD

(It's actually a modification of mainly the old FluxHUD, made a minimal version out of it.)
Hope ya'll like it!

Minimal FluxHUD, finally ready!
I will update it in case updates break it, but I won't be doing any big changes to it anymore.

BIG THANK YOUS:
Flux for letting me use his HUD as the basis for my version.
Donttouchmyfrog for helping me A LOT with HUDs.
Zetorri for testing and reporting bugs and bad design.
People for actually using it!

SCREENIES

DOWNLOAD

Hope ya'll like it!

It's a "separate" HUD, which pretty much uses the regular FluxHUD's files, but the files have been modified quite a lot. I'd recommend installing it as a "new" HUD!

Alright, here it is, consider this as the final version:

What I did:
- More Buttons on Main Menu.
- Changed TargetID placement and HP Buff Cross placement and style.
- Minor Bugfixes.
- Other stuff I can't remember.

Screenies
DOWNLOAD

Hold on! There'll be an update in around 10 more minutes!
Changed quite a lot of things, which I won't remember, but I'll provide the download link, and screenies!

Alright, so I updated the HUD and fixed some stuff:
- Modified TargetIDs.
- Added and moved some Buttons in Main Menu. (Added Replays, moved Adv. Options, moved Training.
- Current version now shows on Main Menu.
- Imported the QuickPlay-screen from RaysHUD. -> Includes the advanced options now.
- Fixed the TargetID %health% not showing correctly. (Broke it in 0.9.0)

Will add:
- Console Button on Main Menu.
- A fourth small Button to make it look balanced.
- Screenies.
- SUGGEST! THANKS!

DOWNLOAD

Alright, so I did quite a lot of stuff today:
- Repositioned TargetIDs.
- Imported Main Menu and Loading Screen from the new FluxHUD-zxcv.
- Added adv. options button in the Main Menu.
- Simplified the Engineer HUD.
- Made the (buff) HP cross a tad smaller.
- Repositioned the Item Effect Meters.
- Fixed quite a lot of minor stuff (that was broken in version 0.8.1).
- (Almost) fixed the Spectator HUD. (Just repositioned the Respawn time which was overlapping with class health. A bug that I don't know how to fix.)
- Forgot what else I did.
- I guess I somehow accidentally broke Server Browser Button. Will fix. Apparently I didin't have to, fixed itself by restarting PC.
- Imported a wrong SpectatorGUIHealth (which makes the TargetID health weird). Fixed.
- Probably broke something else.

What I'm planning to do:
- Add some more small/medium sized buttons on the Main Menu (Replay stuff, Console, etc.)
- Try to fix small bugs that might occur.
- Take a substantial amount of screenshots and upload them somewhere.
- Further change some small stuff, that I might've tampered with already.
- Modify TargetIDs a bit.
SUGGEST, PLEASE, THANK YOU!
- Release version 1.0!

DOWNLOAD

Sure thing! I was actually thinking about doing that today, but then I figured it requires some of the newer files, which would take quite a while to import successfully, so I started doing other stuff instead.
I'm about to release a new version later today, a lot of small changes mainly, and a few fixes. I'm going to start working on the new main menu soon, so expect to see it in the new version today/tonight!

Updated my mod of Flux's HUD!

- Teams (RED/BLU) not on same sides on team selection panel as on scoreboard.
----- Thanks for reporting the bugs above Yes!
- TargetIDs moved to better places.
- Übercharge meter moved down a bit (no clipping with HP cross anymore)
- Added the Map Timer under the Round Timer.
- Minor fixes.

What I'm planning to change:
- Simplifying the Engineer's buildings' icons and all that stuff.
- Suggest and I'll look into it!

I've been having those issues for quite a while, and even knew about them actually, but they never really bothered me that much. Now that I actually did share the HUD, I should've looked into it already and fixed it. Sorry that you had to wait for the answer, and that you had to fix it on your own. I'm going to do some updating on the HUD today, and that'll be included. Thanks for finding the problem, though!

Also, nice name on your rocket launcher.

Updated my previous post! I will keep updating the original post I made, instead of making new posts.

It's cp_badlands.
And I also decided to simplify FluxHUD by removing the boxes, making it a bit more centered, moving certain stuff etcetc.

EDIT: Here's the DL link, since you guys actually liked it!
Also, before you download this, notice that there _MIGHT_ be some minor errors I might've made. There shouldn't be any, but it's a possibility. (things like overlapping item bars) IT IS NOT THE FINAL, BUGLESS RELEASE. So download this only, if you don't mind small errors here and there. I'm planning to continue to update this HUD whenever something comes up that I/someone don't like.
I'll also give the changelogs on this post, and here.

Fix'd!:
- Item panels on loadout screen not showing correctly.
- Quickplay window not working properly, and sometimes making the game crash.
- Teams (RED/BLU) not on same sides on team selection panel as on scoreboard.
----- Thanks for reporting the bugs above Yes!
- TargetIDs moved to better places.
- Übercharge meter moved down a bit (no clipping with HP cross anymore)
- Added the Map Timer under the Round Timer.
- Minor fixes.
- Apparently I did some silly mistakes in the last update (30.3.), and I've fixed them now.
- Fixed duel scores and their positions.

What I'm planning to change:
- Simplifying the Engineer's buildings' icons and all that stuff.
- Suggest and I'll look into it!

http://i.imgur.com/aV436XH.jpg

http://i.imgur.com/fkSet80.jpg

It has been happening to me ever since an update more than a year ago (iirc). It has something to do with DX8.
I would reckon, that it's meant to be that way. Can't be sure about that, though.

Originally Fluxhud.
Screenshots of some of the modifications.

Fixed the scoreboard to show the pings, made the chat box a bit bigger (the old one felt small as hell), and most importantly made the HP background boxes change color when weak/buffed. Also made the payload progress bar a bit wider, and imported the big circle crosshair.
Mainly minor "fixes".

Here's the download link, and I'm going to continue updating it, and fixing the minor stuff if I find any. Suggestions are more than welcome!