Theme developer module crashes the whole site when enabled, how to fix?

Question

I'm working on a clean Drupal 7.x installation, downloaded Theme developer and its dependent module simplehtmldom API( another required module for Theme developer) using drush. I found out that simplehtmldom 7.x-2.x is incompatible; so I removed it, and Installed the 7.x-1.12 version using Drush, enabled it, enabled the Theme developer module was available to be enabled. Now the site doesn't work anymore. All I'm seeing is just some tags like this. < /> < /> < /> < /> < /> < /> < /> < /> < /> < /> The problem is fixed when I disable the Theme developer module manually with Drush; everything gets back to normal, when I disabled that module. I've tried to navigate the site using /node/1 and tried to go to the administration panel; all I noticed is that the title of the page (the one appearing on the browser's tab) appears but the content seems to be the same. How do I solve this issue? This is a screenshot.

sndr · Answer

I had the same issue and I could solve it by switching from PHP7 to PHP5.6 when using the Theme Developer (7.x-1.x-dev).

macjules · Answer

I did manage to get it to work properly … eventually. This is how, on D7 7.5.

Download and install Theme Developer 7x. Do not enable yet. 
Download and install SimpleHTMLDom  7.x-1.12. Do not enable yet.
Download SimpleHTMLDom library from
http://sourceforge.net/projects/simplehtmldom]1 and install to
sites/all/libraries, so that your library path is
sites/all/libraries/simplehtmldom/simple_html_dom.php.
Now you can run drush en -y devel_themer and it will automatically
enable the simplehtmldom.

I did notice that my /tmp folder was not giving correct permissions to the /tmp/devel_themer folder, so doing a chmod -R on that fixed the problem.

Theme developer module crashes the whole site when enabled, how to fix?

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