This should be fixed now.
Details: Last night I changed the treasury data type from INT to BIGINT, but apparently the default went from 0 to NULL in this process. This meant that newly-created clans could not add to their treasury. The two clans mentioned in this thread, Fluids and Shrimp, were the only two affected. I've corrected this issue, so you should be able to donate now and new clans should no longer be affected.
And FYI, there is a 7 day grace period for empty treasuries, so you would have been fine if this were not immediately fixed.
@ActiveX: That sounds like a different issue, probably the one in http://bots4.net/forum/3/5022. I'll investigate more tonight and will reply there.