Ah. Synergy is Sense 2.1, which has a lot of things that Sense 1.0 lacks (MMS settings, Contact groups, etc.). As far as I know, you can't use Sense 2.1 apps with Sense 1.0 without a lot of hacking around with the system. I've had requests to implement functionality found in Sense 2.1, but I've not yet had a chance to look into what would be required to get it to work. It's on my list of things to look into.
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EDIT: For those of you having issues with Stocks, flash the appropriate zip, below:
Stocks Fix
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Deodex
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Odex