If ... Then func() Else ...

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octothorpe

I've simplified your test case. Your code is causing a problem because you're calling a function with two arguments.

If blah Then bar() Else Print ; Expecting Expression
If blah Then bar(1) Else Print ; works fine!
If blah Then bar(1,2) Else Print ; Expecting ')'
If blah Then bar(1,2,3) Else Print ; Expecting ')'
If blah Then bar(1,2,3,4) Else Print ; Expecting ')'
If blah Then bar(1,2,3,4,5) Else Print ; Expecting ')'

Function bar(x1=0,x2=0,x3=0,x4=0,x5=0)
End Function

As illustrated above, the Blitz3d parser chokes on single-line IF..THEN..ELSE statements where the THEN substatement is a function call with (a) any number of parameters other than one and (b) an ignored return value.