No custom modules... I think it's something to do with the wx4 screen set... I just updated back to 3804 and tried some of the screen sets that came with the update, no errors. Tried my screen set Andy_wx4 and got the error, then loaded a screen set from the update and everything worked again... decided to try the un-modified wx4 set that my screen is based on and the error occurred again. Got a couple of jobs to do tomorrow, so I'm gonna roll back to 3155 (I know that version works with my modifications) till I finish them... then I guess, I'll update and start modifying one of the screens that comes with 3804.
Thanks for taking time to reply
Andy