In IE/Edge, TinyMCE is not showing lablels on the buttons in Plone 4.3.7

[cdw9]

Plone 4.3.7 with only plone.app.widgets activated

With portal_css in production mode, the TinyMCE buttons do not display labels in Internet Explorer 10/11 or Edge

[cdw9]

It works once I disable merging and caching on ++resource++plone.app.widgets.css

[davisagli]

@cdw9 omg, that made it work! I owe you the beverage of your choice next ploneconf. Wish I understood why that made a difference though...

[petschki]

@cdw9 is this still valid for v1.9.1 ?

[thet]

@davisagli @cdw9 My guess it's not finding any paths to the tinymce fonts because they are included as relative paths to the css file.
Another fix would be to activate the option applyPrefix="True"in cssregistry.xml for ++resource++plone.app.widgets.css (beware, that's another guess).

[thet]

... applyPrefix should actually already been set to true for latest plone.app.widgets 1.x