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I have noticed over the last couple of weeks that some crops are not growing even though I am not pausing them when I travel
Other than asking support to check your account, are you sure you aren't pausing in error? I admit I have NOT had that problem in almost a year, but for a while I found that I occasionally moused over the pause on the way to another farm...They redesigned the travel screen since then and I haven't found things paused of late.
I still don't know of a reason to pause... with the excessl of unwithers, one can always unwither a farm.