number of forums shouldnt matter… there is certainly, much, much less data loaded there than on the front end… If it was choking from memory for loading those forums, it would be loading an order of magnitude or more data on the front end…
if you downgrade, you will lose data… but you will need the old version of simple press…
change the sfversion and sfbuild options in the database as before… they need to match the numbers in the sp-control.ph file in the older version… I often set sfStartUpgrade back to the last version too…
if you wanted to send us an temp wp admin account with full sp admin capabilities we could take a look… might need ftp access to in order to add some debug code, but can wait… if that works, be sure to pm the data to both mr papa AND yellow swordfish… unfortunately, I leave on a cruise tomorrow and will be gone for a bit over a week…