Xailer & OZ Software

Not quite sure if someone already mentioned, but error below is showing up lately.
Seems something to do with clipboard (probably cut/copy and paste actions from me)
--------------------- Internal Error Handling Information ---------------------
Subsystem Call: BASE
System Code: 1108
Default Status: .F.
Description: Argument error
Operation: AT
Arguments: [ 1] = Type: C Val:
[ 2] = Type: U Val: NIL
Involved File:
Dos Error Code: 0
Trace Through:
AT (0)
TMAINFORM:BUILDMENUCLIPBOARD (951)
(b)TMAINFORM:BUILDMENU (726)
TMENUITEM:ONCHECKSTATE (0)
(b)XMENUITEM:XMENUITEM (499)
TMENUITEM:REQUESTSTATE (0)
TMENU:REQUESTSTATE (322)
TMENU:REQUESTSTATE (324)
(b)XFORM:XFORM (169)
TMAINFORM:WMINITMENU (0)
RUNFORM (0)
TAPPLICATION:RUN (275)
MAIN (31)