Upgrade of Storyline 1 to Storyline 3 courses not working

I upgraded from Storyline 1 to 3 recently and the majority of functions are fine, however, the upgrade is tempermental. some courses that i had in Storyline 1 do not upgrade properly. when i try to open them in SL3 i get the upgrade pop up box but when the upgrade is complete there is nothing in the upgraded file - no slides or anything at all. Some courses upgrade fine but others have this problem seemingly without any reason.

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