daend

Hi. Exactly. These are different installations and both are on one WordPress multisite.

I tried to deactivate all plugins except Jigoshop , but still getting internal server error after activating yours. That will be some issue with multisites setting ?? I have no idea what can it be.

That might be conflict with other plugin. I will try to deactivate and activate them one by one. I am using these:
Affiliates
Affiliates Jigoshop Integration Light
Akismet
Groups
Groups Subscriptions
Jigoshop
Jigoshop – Store Toolkit
Jigoshop Admin Bar Addition
JigoShop Post Layout
Regenerate Thumbnails
Social Metrics Pro
WordPress SEO

Hi,
I already checked these and yes, it happens after installing this plugin. I have to delete it by FTP to be able to get back to admin. Internal server error occurs on whole site (admin and frontend). After deleting WP Menu Cart everything is fine. I tried it several times. My .htaccess file is not corruped. Without plugin it works well: https://fitplan.cz/shop/
Memory limits are also good:
PHP Memory Limit: 256M
PHP Post Max Size: 20M
UPLOAD_MAX_FILESIZE: 20MB
POST_MAX_SIZE: 20MB
WordPress Memory Limit: 64MB

Well there is not much to copy. It is Internal server error 500. I dont know where can I get more info about this error.

I received same error. Problem was in backup path. Be sure directory, where you are backuping exist in dropbox and you dont have / slash at the end of it.
Petr

I just find out that problem is in this two Plugin:

Google XML Sitemaps 3.0.3
Akismet 2.1.3

When I activate one of these plugins and change language in to Czech – adming goes to blank screen.

I dont have access to server error log file, so I cant check if there are any errors.

Template is not yet complete for final release, I have to make it more universal.