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RTX _free_box fails sometimes

Hi all,

Cortex M3
RTX version ? as release with V4.22a
stack = 800 bytes

I've got a fairly large project running on 6 tasks using RTX, and very occasionally _free_box returns that the mail box being free'd is not part of the mailbox pool. This can happen when there are very few msg's in the system and when that are many, does anyone have an idea where to start looking?

Regards,
Dave