Hi Mr_Mayor I think this problem could be caused a third party add-on module you have that subclasses IC in the desktop version of Sage 300 but is incompatible with the web screens version.  Could you let us know the third-party modules you have, or, provide the list of modules you have in the classic desktop under Help -> Sage Support -> Support Utilities -> System Informaiton eg:

AP72A
AR72A
AS72A
BK72A
...etc...?

Could you also let us know the version of Sage 300 you're running including the Product Update level?  Good luck!

the two replies i got from you and DCrampton all pointed to PU

I did what i was dreading

had to uninstall the server, redo and loaded the PU again and all is working 

third party modules i have Norming, Service Manager and Cashbook

Hi Mr_Mayor I'm sorry to hear you had to go through some pain but congrats on resolving the issue and ending up with a clean-working system.  Great work and thanks for the update!  Hope all goes well from here!

Hi Mr_Mayor I'm sorry to hear you had to go through some pain but congrats on resolving the issue and ending up with a clean-working system.  Great work and thanks for the update!  Hope all goes well from here!