Path: utzoo!utgpu!utstat!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!agate!helios.ee.lbl.gov!pasteur!betelgeuse!carlton
From: carlton@betelgeuse (Mike Carlton)
Newsgroups: comp.sys.mac
Subject: Re: Flex and Tetris
Keywords: Flex Tetris
Message-ID: <10902@pasteur.Berkeley.EDU>
Date: 10 Mar 89 07:18:05 GMT
References: <1193@ns.UUCP>
Sender: news@pasteur.Berkeley.EDU
Reply-To: carlton@betelgeuse (Mike Carlton)
Organization: University of California at Berkeley
Lines: 27

In article <1193@ns.UUCP> jmh@ns.UUCP (Joel Halpern 424-1606) writes:
...
>Specifically,  if Flex starts while Tetris is running, the elegant
>background pictures that Tetris uses (MAC II Tetris) get shifted
>to the upper left hand corner of the screen, covering the menu bar.
>Not disasterous, but definitely annoying.
>
>In addition, if Flex was was started while actually playing 
>(as distinct from the control or scoring page), When you hit
>the next key for any reason, the machine hangs.
...
>Joel M. Halpern
>612-424-1606
>jmh@nsco.network.com

I noticed somewhat similar problems with Flex a while ago with another program.
I did some investigating with TMON and it looked like Flex changed the current 
port when it kicked in and didn't restore the port when it exited.  Evidently
most programs can handle that (or Flex only does that to certain programs).  I
had to give up Flex because of it.  Some programs just die because the port has
been changed "behind their back".  In particular, I think Flex set the port to
the WMgrPort and that port has no InvalRgn allocated (this is from memory so is
likely not exactly correct).  If the program does some operation which uses the
InvalRgn of the current port it is likely to go bye-bye.

Regards,
mike (carlton@ji.berkeley.edu   or   ...!ucbvax!ji!carlton)