itix nope, it isn't into mos sdk downloaded with grunch. Btw geit has resolved my problems with simplecat: a space before end line which wasn't warn by os4 catcomp in 2010 ;)
In fact SimpleCat warns about a suspicios \<space> at line end and since there is no \ at line end, it continues parsing with the next line as label, which causes the fatal errors afterwards.
I have an issue with SimpleCat on MorphOS 3.0 (fresh install on PowerBook): add/remove labels buttons are not displayed (I have a blank space instead).