I've got an odd problem - some of my own modules are no longer listed on the Module Definitions page, even though they're available to add in the Control Panel.

They were there previously, and I'm not exactly sure when they stopped showing up in the list or whether this behavior may have been associated with a DNN upgrade or not.  Currently running Community V05.04.04 (2)

Any thoughts would be appreciated!

Happy Thanksgiving Day to all!

I have the same issue and they are not listed in Host :: extensions under Module. The are also not listed under Install Available Extensions. Also, I have tried to install some of the extensions that are under Install Available Extensions and they do not install... just shows Error Installing Module(s):

I had 4.9.5, upgraded to 5.6.0. Had the Telerik problem, fixed that and a couple of errors showing back on 5.1 but all sites are working fine. Only noticed it when I started to add some modules and saw that some of the core modules were missing. I have comparing the database with a clean installed version and it appears there are items missing under the modules defination tables. I am also missing the Create New Module under Host Module Definitions... goes to the page but the Create Module From is not there.