Sends getting lost

[Jon]

I'm writing a program that uses "send mouseup to me in 10 seconds".  
 From time to time, the program stops working, as if the Send is getting 
lost.  I would guess that this happens whenever I go into the IDE and 
switch from "run" mode to "edit" mode (the two icons at the top of Tools).

I looked in the documentation for Send, but there is nothing there about 
this issue.  Are there situations where the IDE clears these pending 
messages?  It would be good to be able to distinguish between proper IDE 
operation vs my remaining bugs.

Jon