Custom module icon breaking

Dear experts,
I have been trying to rectify custom module icon in root folder. Tried various tricks and googling too. I have been not able to rectify.
Please suggest solution for this query.

Thanking you in advance. Have also enclosed screen shot of breakage icon.

Dear experts,
Kindly provide me suggestion for this.

If you are on a Linux environment I recommend that you set permissions correctly, then do a quick repair and rebuild.
Check your system and SuiteCRM logs as well as the browser console for potential errors.

The Forum has plenty of posts of permissions.

Did you OP manage to solve the icon issue?