Freehand selection tool

[Gigatronix Pete]

While using Affinity Photo the freehand selection tool sometimes doesn't work

While holding it I can draw the shape I want but when i release the L/H mouse button rather than completing the shape it just goes blank  ...everything disappears
It doesn't do it all the time  ...I just used it twice on an image & then the third time it wouldn't work.
The other marquee tools all seem to work ok

Any ideas?

[GarryP]

Have you checked which Mode you are using the Tool in (see attached image)?
If you have Subtract or Intersect selected then that might be causing the issue.

[Gigatronix Pete]

@GarryPAs it seems to be intermittent i'm not sure but i will check next time it happens  ...thanks for that sir

[GarryP]

You're welcome. I hope this is the 'fix'. If not, we might need a video showing the problem, if you can manage to get one when it happens.