It is most likely that either:
1) Your web hosting provider has changed the version of Zend on the server, so that now something is not working...
2) Your provider has somehow messed up the files on your account so that they are now indeed corrupted.
What you should do is run the autoinstaller and "re-install" all the files for Snippetmaster. Don't worry -- as long as you have an existing database, no data will get overwritten. (Only the snippetmaster program files will get re-installed.)
If that doesn't work, then ask your web host if they have recently changed anything on the server..
I am 100% positive the problem is with something your web host has done. Software doesn't just stop working for no reason whatsoever, so there must be a change somewhere... and since you did not do it, then this leaves only one possible culprit.
If you get stuck with anything, let me know and I'll do my best to assist.