Decided to go on a whim and install Linux Mint 18 Cinnamon (Based off of Ubuntu 16.04) and that is displaying the steam store, community pages etc just fine.

How odd.

I keep seeing this problem all the time. Sometimes it will work for a while after restarting the system completely, then without warning it stops displaying any pages, just pretending to be loading them forever.

The GNU/Linux client is an embarrassing mess, and considering that Valve is pushing steam machines which run GNU/Linux, there is startlingly little being done to address these numerous issues.

I pretty much had this problem as well (can't use the steam browser, can still play games), still can't find a solution especially when I run: steam --reset, it just said:

Error: Couldn't find bootstrap, it's not safe to reset Steam. Please contact technical support.

I'm using Debian Unstable/Sid amd64, using the non-beta client, and using nvidia proprietary driver.

Image for proof: Imgur Link

I have same trouble. Some pages show up as black and empty while viewing their source text. I can open them through any browser just fine.
Specs: GNU\Linux Debian 8 'jessie' x86_64 with Xfce

Log don't give any clues:

Running Steam on debian 8 64-bit
STEAM_RUNTIME has been set by the user to: /home/user/.local/share/Steam/ubuntu12_32/steam-runtime
ExecCommandLine: "/home/user/.local/share/Steam/ubuntu12_32/steam steam://open/driverhelperready"
ExecSteamURL: "steam://open/driverhelperready"
Generating new string page texture 203: 48x256, total string texture memory is 2.72 MB
Generating new string page texture 204: 256x256, total string texture memory is 2.98 MB
Generating new string page texture 207: 16x256, total string texture memory is 3.00 MB
Generating new string page texture 208: 512x256, total string texture memory is 3.52 MB
Generating new string page texture 209: 64x256, total string texture memory is 3.59 MB
Generating new string page texture 212: 256x256, total string texture memory is 3.85 MB
Generating new string page texture 214: 128x256, total string texture memory is 3.98 MB
Generating new string page texture 215: 256x256, total string texture memory is 4.24 MB
Installing breakpad exception handler for appid(steam)/version(1469850758)
Installing breakpad exception handler for appid(steam)/version(1469850758)
ExecSteamURL: "steam://url/StoreAccount"
ExecSteamURL: "steam://url/SteamIDMyProfile"
ExecSteamURL: "steam://url/StoreAccount"
ExecSteamURL: "steam://url/StoreAccount"
ExecSteamURL: "steam://url/StoreAccount"
ExecSteamURL: "steam://url/StoreAccount"
Generating new string page texture 242: 256x256, total string texture memory is 393.22 KB
Generating new string page texture 250: 64x256, total string texture memory is 4.31 MB
Generating new string page texture 251: 48x256, total string texture memory is 4.36 MB
ExecSteamURL: "steam://url/ManageSteamGuard"
ExecSteamURL: "steam://url/SteamClientBetaBugReports"

Let me add, that also the advertisements at Steam's startup are black. (I am on Debian GNU\Linux testing/stretch amd64 with Gnome and radeon mesa driver.)

I was also experiencing this issue on Debian Testing/Stretch x86-64, but in my case, the error log was helpful, I had a number of these entries when attempting to load :

/home/stuart/.steam/ubuntu12_32/steamwebhelper: error while loading shared libraries: libgpg-error.so.0: cannot open shared object file: No such file or directory

In Debian, libgpg-error is provided by the libgpg-error0 package. You can check if you have the library installed:

find /lib -name *libgpg-error*

Chances are, if you're running a x86-64 version of debian, you'll already have the x86-64 version of the package:

/lib/x86_64-linux-gnu/libgpg-error.so.0.19.1
/lib/x86_64-linux-gnu/libgpg-error.so.0

But Steam requires the x86 package. If you're already running the steam client, you would have already enabled multi-arch and installed a bunch of related packages, so you should be able to solve this with:

sudo apt install libgpg-error0:i386

Then check again:

[stuart@copper ~]$ find /lib -name *libgpg-error*
/lib/i386-linux-gnu/libgpg-error.so.0.19.1
/lib/i386-linux-gnu/libgpg-error.so.0
/lib/x86_64-linux-gnu/libgpg-error.so.0.19.1
/lib/x86_64-linux-gnu/libgpg-error.so.0

Now the store and community pages load without incident.

Hopefully this also help @p-snft @sizeofbool and @grillmaster-t28 who mentioned they are also running Debian x86-64.

@Plagman @gdrewb-valve Since latest Steam Client Beta update, I have no problems mentioned earlier.
Advertisement window, Steam account details page, Steam Guard settings page, Steam Community Forums, all is working now as expected.
Looks like latest update fixed it.
Current Steam version:

@stuartdb That one helped, thanks.

In case it helps anyone else, after a recent steam update I had a very similar-looking issue (black screen at store and community tabs on linux mint 17.1, not run under wine), which was solved by reinstalling libnss3:

sudo apt-get install --reinstall libnss3

https://github.com/adieuadieu/serverless-chrome/issues/53

Found by running steam in terminal and looking through error messages.

Thanks @hillcjames this fixed it for me.

I had the same problem and @hillcjames solution fixed it. Ubuntu 16.04.