Before I proceed, will you please try clearing your cache and cookies to see if it will resolve the issue? Please also let me know the error that you are getting when you are trying to upload your profile image.
Can you please check if the image you're trying to upload is in .jpg, .jpeg, .gif, .png format and at least 250px by 250px? Also, make sure that it's a clear photo of yourself, not a long shot and your face is clearly visible. If it meets those requirements and you still can't upload it then please try clearing your cache and cookies and using a different browser to check if the problem persists.
Let us know if the issue persists.