Using forum instead of official channel because I'm using Mars.  I'm on ubuntu 14, 64Bit. 

The problem is present even if starting Eclipse via sudo

When I go in About -> Installation Details ->Configuration a popup appears:

An internal error occurred during: "Configuration Fetch Job". Invalid thread access

The qnx line in the Eclipse log caught my attention:

org.eclipse.swt.SWTException: Invalid thread access
	at org.eclipse.swt.SWT.error(SWT.java:4491)
	at org.eclipse.swt.SWT.error(SWT.java:4406)
	at org.eclipse.swt.SWT.error(SWT.java:4377)
	at org.eclipse.swt.widgets.Display.error(Display.java:1186)
	at org.eclipse.swt.widgets.Display.checkDevice(Display.java:765)
	at org.eclipse.swt.widgets.Display.getSystemCursor(Display.java:2211)
	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:59)
	at com.qnx.tools.ide.qde.internal.ui.SystemSummaryLicenseInfoSection.write(SystemSummaryLicenseInfoSection.java:50)
	at org.eclipse.ui.internal.ConfigurationInfo.appendExtensions(ConfigurationInfo.java:107)
	at org.eclipse.ui.internal.ConfigurationInfo.getSystemSummary(ConfigurationInfo.java:73)
	at org.eclipse.ui.internal.about.AboutSystemPage$1.run(AboutSystemPage.java:159)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)

Pointers ?