Changing the “dimmensions” [sic] of the logo in the theme options section has never worked for me, either. There is a workaround I am happy to share with you in trade for some feedback on a problem I encountered and which I have described here: https://www.onedesigns.com/support/topic/widgets-php-only-a-maximum-number-of-25-dynamic-sidebars-displayed
Being aware that you most likely won’t be able to solve this problem for me, I need to know whether 1.) you are running the most recent WordPress installation and 2.) the widgets section is fully functional on your blog. Looking forward to your feedback in this matter!