Commented Issue: Error on "Loading page and parsing anchors" [7443]

I try to insert / edit page links with 2.0.4. Then I click on page in a tree, the "Please wait: Loading page and parsing anchors" message appears, and after that I have this exception (100% time, no matter that page I select in a tree):

```
[ArgumentOutOfRangeException: StartIndex cannot be less than zero.
Parameter name: startIndex]
System.String.Remove(Int32 startIndex) +6572058
WatchersNET.CKEditor.Browser.Browser.TreeTabs_NodeClick(Object sender, RadTreeNodeEventArgs e) +1170
Telerik.Web.UI.RadTreeView.RaisePostBackEvent(String eventArgument) +510
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3707
```
Comments: ** Comment from web user: redhound2 **

P.S. Using 2.0.4 version for DNN 5.3 on DNN 5.6.3 install.