ARMember plugin bug when chaning membership plans

I’m testing the plugin using Paypal sandbox and noticed that after a user registers and pays for a membership…

Once logged in, when a user goes to the registration page [arm_setup d=”1″] and tries to change the current plan, the plugin cancels the membership but does not take the user to the Paypal site to proceed with payment for the new plan selected (the user just sees an animated circle that only clears if you refresh the page).

ARMember support told me to replace the wp-content/plugins/armember/lib/paypal/paypal.class.php file, to clear all cache, and then to try again, but this did not solve the issue.

Is this a bug? Has anyone experienced this issue? Is there a way to fix it? I’ve been trying to troubleshoot the issue for a long time, and I haven’t been able to.

Any advice would be greatly appreciated!