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From: rob@cs.mu.oz.au (Robert Wallen)
Newsgroups: comp.sys.mac.programmer
Subject: Problems with Excel and System 6.0.7
Keywords: Excel, 6.0.7, MDEF-5
Message-ID: <3140@murtoa.cs.mu.oz.au>
Date: 27 Mar 91 04:23:08 GMT
Organization: Comp Sci, Melbourne Uni, Australia
Lines: 17

Well, i find myself posting again with the same old problem.

I have an SE/30 running a virgin System 6.0.7 (ran it from my install disks
fresh from apple.com) and Microsoft Excel 2.2a (yes, the 'fixed' version).
When I attempt to make a selection from any menu other than the Apple I get
the bomb box and the message 'heap collided with stack'.

When I tried debugging this little mess with TMON, I discovered that Excel 
uses a mystical new MDEF (ID=5) which seems to have appeared in the system file
along with an WDEF (ID=5).  MDEF-5 seems to have a nasty 'patch my address
back into the MDEF-resource' mechanism to find its vars and for some reason I
am getting an odd value which causes a bus error.  Since Excel also patches
_MenuSelect my guess is that they are stuffing about with it.  Badly!

Does anyone out there (a) actually use Excel under my circumstances (b) have
any idea what MDEF-5 is doing there (my guess is Apple are sticking in support
for Microsoft's helpful menus) (c) have any idea how I get out of this mess?