Shipping, Postage, Order Total Modules are all blank and can't install new ones

[mc12345678]

Strange - I have just had the same issue!

I've not made any coding changes in a long time but suddenly got the same partial white screen.

Amended -

if (zen_class_exists($class)) {

to

if (class_exists($class)) {

and now appears to be fine.

Using 1.5.4 BTW ...

Furthermore, that change doesn't make sense if the admin/includes/functions/general.php is as provided in Zen Cart 1.5.4 because the function zen_class_exists does a check for the presence of the function "class_exists" if that function exists, it executes it, if it doesn't it reports that the class exists... so that change from zen_class_exists to just class_exists should not have corrected the issue...

[lat9]

Noting that the zen_class_exists function was removed from /admin/includes/functions/general.php for Zen Cart 1.5.5 and later.