There was a breaking change in 0.93 that indeed affects the heightmap example which I already fixed but neglected to include in the release zip. Oops.
However I did just now upload the fixed version as an additional file dowload. Please try and see if this fixes your issue.
If you're using projects of yours that have been created before 0.93 you might have a similar issue with those unfortunately. Please let me know and I can probably fix it for you by editing the project event xml file(s) or explaining to you more in depth how to do so yourself.