internet explorer - IE11 - Webpage working with active developer tools... What are they doing? -

i have web page here not working properly.

(it's group manager plugin of scm-manager, that's unimportant detail. if try add group member, member not shown in group.)

after trial , error tests made strange discovery:

if developer tools (f12) open meanwhile, works fine. there not need configuration changed , webpage not have reloaded. needs have developer tools opened meanwhile...

my question is: developer-tools doing (in background?) when opened up, makes webpage working.

some additional things may should know:

• our ie11 runs in compatibility mode (or "document mode" ms calls it) ie7 default
• we use called "ie11epmode", file includes exceptions compatibility mode , located "c:\programdata\ie11epmode\ie11.xml". have used file several times set compatibility mode permanently (and not temporary in developer tools). file gets rolled out in company.
• when trying around, found out: if set in developer tools document mode ie9 or higher works fine. that's why have inserted compatibility rule webpage in ie11.xml (mentioned above) let page run in "edge"-compatibility. if open developer tools, document mode "edge" , marked default. (but still not work if developer tools not opened)
• if choose in developer tools document mode ie8 or lower, have same effect if developer tools closed (= webpage not work)

i hope can me!

thank & best regards

lukas

if webpage doesn't seem running in edge mode current setup try inserting

<meta http-equiv="x-ua-compatible" content="ie=edge" /> 

into head.