When i trying to upload an logo appears this message "An error with logo upload has occurred, please try again".

And when i trying to upload a cover appears this "An error with cover upload has occurred, please try again".

For logo i used an image of 128x128, 233kb and extension .png
For cover i used an image of 1024x768, 884kb and extension .jpg

Check chmod settings for plugin image folder to be 755

Thanks, this worked.

Is it possible to allow the upload of a JPG profile photo/logo bigger than 100x100px?

My users are professionals and may prefer to upload an headshot (that they mostly have in .jpg format)

Thank you!

@MagicM
Yes, there is just limit on size.
- icon: 1MB
- cover: 8MB

You can find these in user/profile.php