Sorry, I have not read this page for a while. KILL_NOTIFY in WIDGET_BASE was added recently in 0.79.5. CATCH in XMANAGER is missing, I'll add it in the next snapshot.
These errors come from an unfortunate coincidence. I have added signed bytes to FL, with the conversion function SBYTE (an analog to BYTE). CMSVLIB uses an array named SBYTE with subscripts SBYTE(....
I'll add help, /device in the next release. I need feedback from users, so carry on commenting :-)
Widgets are in a 'proof of concept' state, many routines and keywords are missing. A more complete implementation will come later this year. (I'll add TITLE for the next release.)
Thanks, there is a wrong entry in the limits table :-( I'll fix it in the next release, until then you can use long('80000000'xul) as a quick fix.