We just updated to 1.91 build 10030. Everything seems to work fine except when we test a survey that has questions that appear based on conditions. Also, we tried the "reset conditions choice in the admin section" and got the server 500 error. We went to each question, deleted the condition, and the survey worked. We reconfigured the conditions and as soon as a condition need to be processed, we get a server 500 error. We turned on debug but there is no debug info on screen.
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