single-product categories Stopped working

The single-product categories stopped working, it is going to a blank page and when I do a view source the only thing on the page is

1
2

in the top left corner and nothing else.

I was on the site earlier this week and I am pretty sure it was working then. I had an order late thursday and no reports of problems so I am pretty sure it happened sometime yesterday or today. Put in a ticket to my hosting company and they do not seem to think they have done anything.

It has been working fine since last Nov.

All the other pages work fine as far as I can tell and if I turn it off it does go to the category page just fine.

I tried it in a couple different browsers and the result is the same in both. (IE and FF)

version seems to be 1.38a. I did all the security patches when I first installed it an I checked a month or two later but have not done any upgrades since then.

If anyone has any idea I would appreciate it.

Thanks
Richard

All the other pages work fine as far as I can tell and if I turn it off it does go to the category page just fine.
Turn what off??

Use FTP and browse your files for modified date that is recent

Also check the admin > config > layout settings > for the setting for single products

kobra:

Turn what off??

Use FTP and browse your files for modified date that is recent

Also check the admin > config > layout settings > for the setting for single products

When I turn off the single-product categories in the admin (set to false) it goes to the category page fine. When it is enabled instead of going to the product page like it has been for the last 10 months I get the blank page.

I will check out the files and see if I can find anything.

Thanks

Might review this
https://www.zen-cart.com/tutorials/index.php?article=82