Problems with editing messages and thumb nails

[vb50kgpoo]

Hi
I am running vBulletin 4.1.12 Patch Level 3
I am sure the issue is with a server move (my hosting company migrated / upgraded servers), and that I need to ask my hosting company to turn some feature(s) on, but I do not know what / which!

Problem One
OK, no matter what browser I use, when I try to edit a message, the text area is blank, both in quick and full edit. Everything else seems to be OK.

Problem Two
Whenever anyone uploads images, no thumb nails appear, not in the image upload manager area (just generic "?" images appear), or in the posts themselves (before we got thumb nails, now we get "img1001" etc. href links to images)

Can anyone help? What tap do I need to get my hosting company to turn on?
Regards / RSVP
Mark