When I want to add an event image I get a white screen.
I can not select an image.

I use joomla 3.4.0.
PHP version 5.5.21

I don't think there is a conflict, because I use a clean install and the one and only extension that i have install is iCagenda.

On a other install of joomla 3.4.0 (on a other server) this works. The only difference is that there i have PHP version 5.4.33.

The other difference that i discovered is the url.
On the website that works the url = "/administrator/index.php?option=com_media&view=images&tmpl=component&asset=com_icagenda&author=&fieldid=jform_new_icon&folder="
On the website that doesn't work, the url = "/administrator/index.php?option=com_media&view=images&tmpl=component&asset=com_icagenda&author=&fieldid=jform_new_icon&folder=&ml=1"

So there is some extra: "&ml=1"

I found the problem.

i forgot that i installed a plugin from Nonumber (modals).
This plugin add "&ml=1" to the url.

After u uninstall the plugin from Nonumber everything works just fine.

Do you have the same issue with articles images when this plugin is installed ?

Yes with the articles images i had the same problem.

Do you have reported your issue to nonumber developer ?

I did.