Hello, 

All of a sudden I found myself incapable to load my Forum.saiga-12.com site as it returns 'Something went wrong (...) Error code: EX3' (see the screenshot attached). As I try to access ACP I fail with the following message displayed:

[[Template core/admin/system/login is throwing an error. This theme may be out of date. Run the support tool in the AdminCP to restore the default theme.]]

Any ideas what this could and what is the point we're supposed to start troubleshooting from? Any kind of assistance would be appreciated.

Awww... neglect this request, guys. As I checked the error log, the 'file system full' appeared to be a problem. Resolved the problem successfully.

Glad to hear you managed to get that resolved 🙂