Deleting Blocks in RISE

I am building a RISE course and I'm trying to delete some blocks (particualarly an interactive block which shows a storyline slide) and then some divider blocks.  However, the trashcan icon is not performing its task when I click on it.

It will let me move or duplicate successfully.  But delete does not do anything.  I am the "owner" so have correct permissions.  Have tried in both Chrome and Firefox and even tried rebooting my PC.

I'm in topic 3 of 4 of this course with no problems until now.  

Any suggestions appreciated please!

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