A fix for the issues brought into Steam’s latest client API preventing external SDKs and build tools to be called within GameMaker: Studio has now been pushed to Steam’s public client beta prior to being released live.

Anyone can access the Steam client beta, so for instructions on how to opt into the beta, please see here: http://steamproxy.com/groups/SteamClientBeta/discussions/1/864957817328247556/

A huge thank you to everyone for their patience while we looked into this and to the guys at Valve for responding and fixing this issue so quickly!

-The YoYo Team

We’re aware of an issue with Steam’s latest client API, released on the 22nd of April, that is preventing external SDKs and build tools to be called resulting in failed iOS, Android, Windows Phone and Ubuntu builds amongst others.

We are looking to resolve this issue as quickly as possible with Valve, and will update the known issue at http://help.yoyogames.com/entries/50884976 the moment we have more information.

Until this issue is fixed we can only suggest putting off the Steam client update.

- The YoYo Team