With the release and abandonment of Sin Episodes due to Ritual Entertainment's buyout, a series of bugs has been leaved unpatched and are currently still in the final product. This page tries to collect all of these bugs and provide a fix for them if any are available at the current time, for both the game and the SDK itself.
Hammer crashes upon launch with the error message 'Can't find steam app user info'.
Create a new file called 'SteamAppData.vdf' in SinEpisodesSDK\config and place this text inside of it:
This can be fixed by copying the 'filters' folder from inside any source game into the SinEpisodesSDK\bin folder and afterwards restarting hammer.
Decompiled arena maps have some of their textures missing.
Arena maps have for whatever reason some set of textures packed inside of them and is easily fixed by opening their bsp files with GCFScape and copying the folder materials\maps to SinEpisodesSDK\SE1\materials.
The magnum gun model does not display with weapon_magnum in hammer.
Open up SinEpisodesSDK\bin\SinEpisodes.fgd in a text editor and search for "weapon_magnum". Here replace the content inside of the 'studio' closure right next to it with "models/weapons/w_magnum/w_magnum.mdl", save the file and restart hammer. The weapon_magnum entity should now show up correct in hammer with the magnum model.