Hi, this has been reported a number of times with different rom's.
A search on the forums will show a fix, i believe I have read a number of times it is an issue with an SPB program & something to do with the today screen.
Although I do not run any spb programs, (and you do not say if you have)so have not kept the link.
Hope this helps, the best advice I can give at the time is to have a search through the rom threads.
And as for the second part of your question/statement, try whichever rom you like, but yes you will have to re-install & I would heavily advise you to read, the relevant threads for the roms or on the first page Windows Mobile 6 Links (about 3rd sticky down) & then MR VANX HERMES UPGRADE GUIDE , an excellent walk through of installing any rom etc.
Ex Orange (UK) M3100
Rom: Manila2DColour :
BL: 2.10 Olipro