I hAve the germAn keyboArd lAyout, And I did not instAll Anything thAt
explicitly fiddles with the keyboArd.
The lAst thin I instAlled before I noticed the bug wAs the PAlm-Desktop
version 4 + A softwAre cAlled "SmArt TrAsh".
whilst typing this followup, its exactly "Smart Trash" that put up an
empty-trash notice each time I hit the "a" key...
SmartTrash has a shortcut menu, where you can choose the key together
with the modifier keys. I unchecked all modifier keys, thinking this
will disable the shortcut altogether, but heck, no! Since the key
selector remained in the "A" position, the shortcut was assigned purely
and simply to the "a" key.
But as long as no files were in the trash, hitting the "a" key had no
effect on SmartTrash... !
Thanks for your help anyway, and have a good time!