With Mac OSX Lion coming out any day now, you should be aware of which apps might not pass the compatibility check with Version 10.7. A growing list can be found here of both what will work, as well as those that will not. Of note in the latter category would be Quicken for Mac.
In a recent blog entry, Intuit clearly states that they will not support Quicken for Mac in Lion, and that users should consider migrating to Quicken Essentials to Mac if they would like continued support for their financial software needs. Be advised – the article clearly states that you would need to do the migrating BEFORE you upgrade to Lion, as even the data itself from Quicken for Mac will not open in the newest iteration of the Mac OS.
Rather than dealing with the hassle of juggling software that clearly has no desire to offer a clean upgrade path, I propose an alternative – switch to iBank from IGG Software. They are a native Mac application and have the smooth interface, drag and drop simplicity, and a support structure that Mac owners have come to expect from companies who get it.
Check out this earlier post for a breakdown of iBank.