I don't know if this only happened after the last update of Firefox or not, but I noticed that I lost the bars on IR bar graphs on Firefox 54.0.1 using Apex 5.0.3 (during a demo for a customer, imagine...)
I can't reproduce this on apex.oracle.com, so it's probably also Apex version dependent. I can upgrade to 5.0.4, but going to 5.1.x. is not planned for this year (yet).
Anyone else noticed this?
Firefox:

Chrome:
