Did you use stock browser to download. It often has trouble. Try dolphinhd or one of the other browsers. Also it sounds like you just rooted. Make sure you read a bit about rooting, using bootstrap which you will need to use to apply the file. Also download RSD lite and full stock 2.3. 34(froyo) sbf files onto your computer in case you get into trouble. An easy way to get all the files is buy the TBH app. For two bucks with a good wifi connection you can download every thing you need and then transfer the rsd and sbf files to your computer.
For more info to to the droid x forums, they have all the info and then some. Gingerbread is great but don't risk your phone!
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