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Number of replies: 12Sorry but I don't understand your explanation.
You said that Adaptable was installed in your site and then the admin page was blank but you were able to remove it using the admin page?
Then you removed Adaptable from the folder and database and the site still shows a blank page.
After read this, I don't see the relationship of the issue with Adaptable. It looks a moodle installation issue.
Try this:
Add these lines to config.php:
$CFG->theme = 'clean';
$CFG->themedesignermode = true;
Enter to your site and it should show the Clean theme and then you should able to manage the site. If not, you have a problem in your moodle site.
Even Adaptable is compatible and was tested originally with moodle version 2.8, it is possible that latest changes broken this compatibility. Moodle doesn't provide support for version 2.8 (ended in Nov 2015) and we will stop support in the next days (security support finish in next May).
New Adaptable versions couldn't be compatible with deprecated versions (we don't test 2.8) . So update to 3.0 (or 3.1) as soon as possible.
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Have you tried clearing out your caches? Sometimes it is necessary to manually delete the cache folders in your moodledata (not moodle code) folder.
The problem is clearly located in your moodle site not in the themes. Verify permissions and the error_log file. If the site is redirecting you to admin means there are some pending update. So remove all the external plugins.
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Could you add these lines to the config.php:
$CFG->debug = 6143;
$CFG->debugdisplay = 1;
These lines enable the debugger to Developer mode so we can see some error/warnings that moodle could find.
Next time this happens, first thing delete your cache and localcache folders from moodledata folder, refresh your page and see if everything comes back as it should. this usually happens due to corrupted cache specially while installations and upgrades. once you refresh page, your two deleted folders will come back automatically, so dont worry about deleting them.
The first thing to do when you get a blank page is to change Debugging to DEVELOPER level, so you get an error message.
If you get a blank page then there is no way to get to the debugging page to turn it on. 
Fernando's lines above - added to the Moodle config.php - turn on developer level debugging and enable displaying it without going to the admin page, so useful for a broken site like this where debugging was not already enabled.
Also see: https://docs.moodle.org/28/en/Debugging#What_to_do_if_you_cannot_get_to_the_admin_screens.
My gut says to remove the theme files, entries in the database and clear the cache - as mentioned above too.