Visual Editor Tools and Content not showing

I’ve noticed for some months now that Text Editor widgets are very slow, sometimes requiring a page refresh to function at all
Nonetheless, my widgets and website have been working for more than 1100 blog posts over nearly 2 years
http://voiceofbyron.com.au
Now today, I tried to add a new Editor Widget into the Primary Widget Area – tried both Visual Editor and Site Origin Editor
None of the Tool buttons appear using either Editor Widget. In Text mode, some code flashed for maybe a tenth-second, then nothing there either
This also applies to widgets that have been in place for over a year
NOTE that all widgets still display when viewing the website
I’ve cleaned the cache, changed browsers, added the line of code mentioned around the web to my wp-config.php file – define(‘CONCATENATE_SCRIPTS’, false);
UPDATE #1: I have tried swapping to standard WordPress themes – problem still exists
UPDATE #2: I have tried disabling ALL plugins except TinyMCE Advanced, Black Studio TinyMCE Widget and SiteOrigin+Widgets. Problem still exists.
UPDATE #3: I successfully tried adding a title to both the Visual Editor Widget AND the SiteOrigin Editor.
I then saved them, then opened both to edit again
In each case I was able to add text code…
And in each case this workaround helped me solve my current problem.
UPDATE #4: PANIC! I tried adding a Title to one my my existing (paid advertising!) widgets, but it destroyed the content of the widget
But it still means neither plugin is working as it should
I’d really appreciate some help with this issue
John