Issue with text boxes disappearing when course is published

I created a health & food safety course in SL2 and there are a small handful of users that are experiencing the following issue.

On one slide, the learner needs to click an image which should then display a layer with text which explains the image.  For a couple of people a week, when they click on any of the images, the text doesn't appear.  The background fades as it should but the layer doesn't show.  The seekbar is switched on in this course but pressing the restart slide wheel doesn't fix the problem.  The only way to resolve it is to start the course again which is very frustrating.

I can't see any triggers that could be causing this as it is a simple show layer trigger and the majority of learners (nearly 2500) are not having this issue.  

Does anyone have any suggestions on what could be causing this?  I thought it may be caused by the computer losing connection but it is odd that it only happens on this slide.

Thanks

3 Replies
Sally Matson

Thanks for the reply Leslie.  I haven't been able to replicate it and getting system information from the staff completing the training is very difficult.  I suspect it is a hardware issue/internet connectivity issue as our equipment is quite old.  It is just very odd it is always that slide as other slides within the course are built in the same way but don't seem to have this issue.