text: <s>[INST] Logix designer Compare tool, AOI logics not opening. I cannot open AOI logic in compate tool. I clicked several times on it but not open. My both projects AOI protected with a security  key file with extention .sk, but I go to tools, security  section, select. Sk file and un protect project AOI in rs logix. Why I cannot open and see changes in the AOI logics? [/INST] Protected AOI can be compared, and double-clicking on the Logic icon should open the Ladder Content window at the top. If the SK.dat file is missing, it is indicated near the Routine name in the compared content, and clicking on the Logic icon still opens a window on the top, with some encryption information and timestamp. As you wrote, your logic has been unprotected, so the comparison should basically work like all other routines. I suggest to check the Compare Tool version, and try a Repair or just an update of the tool if a newer version is available (maybe it's an old version). About the other message you got about memory, it usually happens when trying to compare large arrays or very complex file. As you mentioned it happens during .pdf export, it may also be related to corrupt or old Compare Tool version.\n </s>