Yesterday we got some support from IPS (makers of the forum software) to resolve an issue where sometimes replying to topics either didn't complete (didn't show you the saved post being added on) or in some cases even threw up a database driver error. This, in a nutshell, had to do with how likes are processed within topics, and appears to be a bug in 3.2.x versions.
This has now been patched by DaveLegg. So if it happens again please let us know (but do screenshot what happens though).
A screenshot of the driver error page doesn't contain any useful information anyway, all it tells us is an error occurred. There are many possible reasons for seeing that page, we fixed one of them, its not surprising that others still occasionally happen.