Cannot use Insert in Filtered HTML mode

Here's a set of relevant questions:

Does Full HTML have CKEditor enabled on it as well?
Are you using WYSIWYG module or CKEditor module?
Is this the Body field, or another field?

Surprisingly, I have the same issue.

The issue was that Filtered HTML didn't had the Image button enabled, while Full HTML has.
Enabling the Image button on Filtered HTML solved the issue.

Yeah, it seems that in some wysiwyg editors you must have the image button enabled for it to function. I don't think this is related to the insert module, but I'll leave that for quicksketch to decide.

I think you must add the image tag for filtered HTML mode, no ?

In configuration > content authoring > text format > filtered HTML
At the bottom of the page "allowed html tag...", add <img>

And normally, it works.

I hope that can help someone :)

(and sorry for my english ! ^^)

Yeah, it seems that in some wysiwyg editors you must have the image button enabled for it to function.

Thanks David, it's probably related to CKEditor 4.x and it's auto-stripping of tags for which there are no buttons enabled. Insert already provides a helpful message for plain-text areas if the <img> tag is not supported, but extending that to WYSIWYG editors could prove challenging. I think we'll probably have to forgo this as part of the Insert module.

Thanks everyone for your input here!

I was having this issue with the Basic Package of CKEditor. The img tag was allowed in the filtered HTML text format, so that was not the cause.

I installed the Standard Package in the /sites/all/libraries/ckeditor folder and now Insert is working as intended.