Hi Renne,
I developed the TBGL_SpriteExists for you, you can download new TBGL with updated help file here:
Latest TBGL (it will be added to next ThinBASIC release)
Regarding the crashes - I am not sure what could be the case. Do you think you could upload somewhere test script which crashes, so we could test it?
Using parenthesis should be okay
Petr
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