CMS Made Simple Forums

I've just had an odd problem. CMS has been working fine until this morning.  First when editing a page \r characters started appearing after saving in. I deleted them but the kept re-appearing. Tried deleting them in wysiwig and source views. Later I tried editing a different page and on saving the content disappeared and I got the error; No Content given!. I turned off wysiwg editing but got the same problem. I tried adding a new page and the page details saved but not the content. Is this a database problem or CMS problem. I've tried clearing the CMS cache - no difference. The database is MySQL 5. I've tried a different site using 4.0 and that seems fine.
I'd planned to add a lot of content today so any help appreciated.

Chris

Beginning to suspect the problems are network or dbserver problems.
Moved to an MySQL 4 server - so far so good. So may be the problem was MySQL 5 or the db server. When I create a database my host assigns it to a server at random - all DB servers are behind a firewall. Could also being problems with the (transparent!) cache my ISP uses. ISP is undergoing maintenance at present so am experiencing odd problems elsewhere. Going to give up for today - hot and sunny  so will  fire up the BBQ and have a few  beers!