We encountered a few minor compatibility issues between CF8 and CF10, but most were related to more complex/non-standard tag use within the applications. Like in our apps we prefer to control the client side cookie storage using CFHEADER and by default, CFHEADER blocks CFID and CFTOKEN as variable names. I vaguely remember one other issue that was simple to fix but I can't remember off the top of my head. Between CF10 and CF11 we have not encountered any compatibility issues. The speed and security improvements are worth the upgrade. Good luck.
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