Confirmed. ValveSoftware/Counter-Strike-Global-Offensive#328 refers.

@martino-valve I had tried verification of game cache multiple times, and it would find nothing wrong with the files.

Switching back to the regular client seemed to have fixed it for some reason

I can confirm that switching back to non-beta steam client solves that issue.

I had the same problem on two computers, after switching out of beta, it's running fine again.

I have been having this issue on SteamOS where I am a beta participant. This issue was not occurring about 2 weeks ago on on the same system.

I was getting: "Pure server: file [GAME]\pak01_040.vpk does not match the server's file." after a min of playing csgo. I verified game files and the issue persisted. Checked the md5sum of the file:

36814b3628d83d1134b82e23252b5920 /home/steam/.local/share/Steam/SteamApps/common/Counter-Strike Global Offensive/csgo/pak01_040.vpk

Also the file had a mtime of 11 Dec which matches quite a few other csgo vpk files, I had none older than that but quite a few newer than 11Dec. Clearly the file content had not changed recently on my system.

I then deleted the file and re-verified which caused a new pak01_040.vpk to be downloaded. Checked the checksum of the new file ... it is the same as the old one ( 36814b3628d83d1134b82e23252b5920 ).

Started playing csgo ... played 1 round and then:

"Pure server: file [GAME]\pak01_039.vpk does not match the server's file."

Will opt out of beta and try again.

Confirmed with Linux Steam Beta client.

Looks like this is also a problem on Mac:

http://www.reddit.com/r/GlobalOffensive/comments/33vy7f/i_tried_reinstalling_i_tried_verifying_and_i/

I saw a few other similar reports as well.

Same issue with Ubuntu 14.04 but with [GAME]\pak01_008.vpk. Tried reinstalling game, and verifying game files. No luck. Plz fix.

Confirm Issue on ubuntu 15.04 with steam beta. Will try without beta.

.pak files look unchanged. Checked the .pak files with sha256sum within Beta and Regular Steam client: https://www.diffchecker.com/1sy95j48

Using the Beta client one can play the local (Offline) maps just fine but when connect to remote (Valves) servers the 1st thing I notice is the motd is missing the image, it is just greyed out instead, then once game starts sometimes it's missing textures showing ERROR textures, the map is all black except for the player dots, players avatars seem wonky or missing and then it will play for a little while and then get kicked out of game with the pak error.

Let us know if we can help further.

Checked pak file hashes on my SteamOS and Trusty installs:

Trusty Not Beta:
user@trusty:~$ find ~/.steam/steam/SteamApps/common/Counter-Strike\ Global\ Offensive/csgo -maxdepth 1 -type f -name '*.vpk' -exec sha1sum {} ; | awk '{print $4 " " $1}' | sort | sha1sum
50c551632377f96fda04b5112746fde4b1a8ad96 -

SteamOS Not Beta:
desktop@steamos:~$ find /home/steam/.local/share/Steam/SteamApps/common/Counter-Strike\ Global\ Offensive/csgo -maxdepth 1 -type f -name '*.vpk' -exec sha1sum {} ; | awk '{print $4 " " $1}' | sort | sha1sum
50c551632377f96fda04b5112746fde4b1a8ad96 -

SteamOS Beta_:
desktop@steamos:~$ find /home/steam/.local/share/Steam/SteamApps/common/Counter-Strike\ Global\ Offensive/csgo -maxdepth 1 -type f -name '_.vpk' -exec sha1sum {} ; | awk '{print $4 " " $1}' | sort | sha1sum
50c551632377f96fda04b5112746fde4b1a8ad96 -

Rebooted after opting in to beta.

Can confirm I also get the grey motd reported by idk, do not get this when not signed up to beta.

Confirming that this issue appears to have been fixed with the May 01 Beta Client update. :+1:

Fixed for me.