Is Atelier's "Check for Updates" broken?

Hi John,

We fixed an issue this morning. Could you try that again and let me know if that works now?

Thanks,

Joyce

A new build 123 is available this morning. To fix this in an older build of atelier please add the mars update site to the available sites in the user preferences;

http://download.eclipse.org/releases/mars

After update  today Atelier crashes when opening the old workspace.

head of the log for that: 

!SESSION 2016-04-11 10:23:29.661 -----------------------------------------------
eclipse.buildId=unknown
java.version=1.8.0_73
java.vendor=Oracle Corporation
BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=en_US
Command-line arguments:  -os win32 -ws win32 -arch x86_64

!ENTRY org.eclipse.osgi 2 0 2016-04-11 10:23:31.062
!MESSAGE org.eclipse.jface.messages cannot be found by com.intersys.eclipse.hidpi.aspects_1.0.0.201601280058
!STACK 0
java.lang.ClassNotFoundException: org.eclipse.jface.messages cannot be found by com.intersys.eclipse.hidpi.aspects_1.0.0.201601280058
    at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:439)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:352)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:344)
    at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java:160)
    at java.lang.ClassLoader.loadClass(Unknown Source)

....

!ENTRY org.eclipse.osgi 4 0 2016-04-11 10:23:35.149
!MESSAGE An error occurred while automatically activating bundle com.intersys.eclipse.studio (324).
!STACK 0
org.osgi.framework.BundleException: Error starting module.
    at org.eclipse.osgi.container.Module.doStart(Module.java:580)
    at org.eclipse.osgi.container.Module.start(Module.java:439)
    at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:454)
    at org.eclipse.osgi.internal.hooks.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:107)

...

With the new workspace Atelier explorer has an error

Plug-in "com.intersys.eclipse.ui" was unable to instantiate class "com.intersys.eclipse.ui.views.AtelierExplorer".

And Server explorer does not save connection even when it test it ok.