With the core update to using TinyMCE 4, your IpsumJam module will stop working. I expect this only applies to designers and people currently preparing their site - I haven't heard of any live sites using IpsumJam (except for the service api at ipsum.ultrajam.net).
https://www.jamroom.net/the-jamroom-network/forum/announcements/13452/jamroom-core-529-update-to-tiny-mce-4
I will get the IpsumJam client module updated as soon as possible to work with TinyMCE 4, please bear with me if you are currently using it whilst developing your site. Shouldn't take more than a couple of days to get the update into the Marketplace.
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¯\_(ツ)_/¯ Education, learning resources, TEL, AR/VR/MR, CC licensed content, panoramas, interactive narrative, sectional modules (like jrDocs), lunch at Uni of Bristol. Get in touch if you share my current interests or can suggest better :)