C5 System logs me out constantly

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I am using the Ecommerce add on and having troubles with the product function, at the same time as the system started logging me out constantly. I am unable to access the file manager and am denied access when trying to edit.

I get logged out at every click and taken back to the login page (our site is administrators only right now). We use "stay logged in" from the home page and that seems to be helping sometimes.

Could these two issues be related? Would the login issues be a hosting/server issue?

We changed the permissions on the package directory from 755 to 777. I still can not access files through ECommerce->Product.

Also, my page editor is glitchy now, when I click on edit on a page, it goes into edit mode with red boxes. I can click on a block and choose to "edit block", but I get the "access denied" error when trying to add or edit any block.

Can anyone help?? Thanks! Mariesa