Unable to Serve this Request/Site Temporarily Unavailable

Hi, I have a v 3.0.5 CS-Cart install that runs fine as a live site and has been for months. Lately when I try to add products in the admin though, I am getting this error almost every time: “Unable to Serve this Request” and “Site Temporarily Unavailable” (a plain gray screen). If I go back in my browser, I can go back to admin and click to other pages with no problem - this only happens when I try to save a product that I’ve added or edited, or save changes to page content that I’ve edited. I have 574 products and maybe 30-ish content pages. Admin is definitely slower than in other CS-Cart installs that I’ve done, and there is a delay before I get this error message as if it might be timing out, or maybe it’s a permissions problem? I have no idea, but I am hoping for help because I have to add and edit products ASAP for my client.Thank you!

Who hosts your site? My guess is that it doesn't like the frequency of requests given that much of what you're doing is AJAX requests.

Hi, The site is hosted with Rackspace. Do you know if they are a company that would have problems with AJAX requests? Is it common? We have another CS-Cart site hosted on Rackspace also and have never had this problem, but the other site doesn't have even close to the same number of products - more like 50 products.

I spoke with Rackspace support, and they directed me to the PHP error log on the server, which showed the following errors each time I got the above error on the screen:

[06-Aug-2013 08:57:34 America/New_York] PHP Warning: Illegal string offset 'is_edp' in /mnt/stor09-wc1-ord1/790883/www.sasademarle.com/web/content/var/cache/templates/customer/%%C0^C0D^C0D66DDE%%product_data.tpl.php on line 998

[06-Aug-2013 08:57:34 America/New_York] PHP Warning: Illegal string offset 'attachment_id' in /mnt/stor09-wc1-ord1/790883/www.sasademarle.com/web/content/var/cache/templates/admin/%%A7^A71^A714741F%%update.tpl.php on line 22

[06-Aug-2013 08:57:34 America/New_York] PHP Warning: Illegal string offset 'description' in /mnt/stor09-wc1-ord1/790883/www.sasademarle.com/web/content/var/cache/templates/admin/%%A7^A71^A714741F%%update.tpl.php on line 59

[06-Aug-2013 08:57:34 America/New_York] PHP Warning: Illegal string offset 'position' in /mnt/stor09-wc1-ord1/790883/www.sasademarle.com/web/content/var/cache/templates/admin/%%A7^A71^A714741F%%update.tpl.php on line 68

[06-Aug-2013 08:57:34 America/New_York] PHP Warning: Illegal string offset 'filename' in /mnt/stor09-wc1-ord1/790883/www.sasademarle.com/web/content/var/cache/templates/admin/%%A7^A71^A714741F%%update.tpl.php on line 73

[06-Aug-2013 08:57:34 America/New_York] PHP Warning: Illegal string offset 'usergroup_ids' in /mnt/stor09-wc1-ord1/790883/www.sasademarle.com/web/content/var/cache/templates/admin/%%A7^A71^A714741F%%update.tpl.php on line 187 Any idea what could be causing these errors? Thank you!