I dont know why my linux wallet wouldnt update i went 12 full rounds and it got stuck on that block each time. Before i went to bed i downloaded the windows wallet and let it update and it was fully updated overnight. put the dat in from the linux box and its working good now.
Good to know that you got it fixed. Yes, Linux and windows wallet files are interchangeable. They can be copied back and forth.
The mac wallet folders are not compatible with window/linux, and usually needs a bootstrap to get the blockchain. backed up wallet files are interchangeable on mac/windows/linux though.