SteamDB has spotted an update for the game:
Size is ~35 MB (with Workshop Tools installed). More info will be edited in when available.
Protections against deliberate tampering of game files to cheat in online matches (or even filesystem corruption) have been strengthened as (& relayed to the GC). If local modifications to game files are detected,
- Users will that may spook some into thinking they've been VACcinated (rest assured though, it isn't an actual VACcination)
- Any modification to gameinfo.gi in dota, intentional or unintentional, will cause those CRC checks to fail and prevent online play, even if you don't mount a custom VPK structure and do something as benign as removing comments
- If you know for a fact you haven't modified your files but now come across this notice, the storage device you have Dota 2 installed onto may be failing. If this is the case, take action now to prevent data loss and immediately back up your files.
Source: https://www.reddit.com/r/DotA2/comments/s46mj8/dota_2_update_for_11422_11522_utc/
