Distributed Videos Delayed When Loading in LMS But Show First Screen

Sorry for the lengthy post! I have six projects where the requestor has 60-90 minute videos where they wanted Closed Captioning inserted  (and did not want to use YouTube) and wanted overlay Knowledge Check questions interspersed throughout the videos. I was able to accomplish all of this (by inserting the videos as Slide Videos and distributing them across the slides.)  However, we are having an issue in the LMS (Cornerstone) with people resuming where they left off.  What is happening is they stop and/or exit the module and the LMS. When they log back into the LMS and resume, they are often (but not always) presented with a screen shot of the first video image for the first slide. The issue appears to be a delayed loading issue because if you wait 1-2 minutes, it will bring you back to where you left off.  In addition, I added a screen count at the bottom of the screen so it will for example say Screen 23 of 45 but will display the image for the first slide/screen. The user does not realize that the module is still loading when they resume and think it has gone back to the beginning. I tried changing various settings in Captivate including setting a Preloader image and setting the Preload to 100% but it has not solved the issue. I thought Captivate would show a Loading message if the module had not completely loaded but even when that option is set, the message appears momentarily but disappears even though the video has not seemed to load completely as noted above. The size parameters are within our LMS limits as well and we have no LMS settings which relate to this issue. In retrospect, I probably should have divided the video up but since it was within the LMS size parameters and seemed to work OK in testing, I thought I was OK. I don't think there is an easy way for me to divide the video up without recaptioning everything since Captivate seems inflexible with importing/exporting caption files between videos and/or editing videos within Captivate. Any ideas would be very much welcomed as there must be something I am missing.  Thank you!