Permission issue

this is really kinda weird
I uploaded to the content dir the latest version of the theme I was working on. & all of a sudden I no longer have the permission to edit any of the files I uploaded on the wp-admin panel
I didn’t change any of the settings. I followed the instructions and right clicked on the index.php (both inside & outside the variuos level folders, mine & the one w/wp)
And the permissions settings seem correct.
Any advice on how to solve this (wordpress…so much fun)?
Thank you