Cannot use OMERO plugins after session timeout

[ctrueden]

The OMERO service keeps trying to use the existing OMERO session even after it times out, resulting in errors like:

[ERROR] null
java.io.IOException: io.scif.img.ImgIOException: java.io.IOException: io.scif.FormatException: Error communicating with OMERO -- server version mismatch?
	at io.scif.services.DefaultDatasetIOService.open(DefaultDatasetIOService.java:135)
	at net.imagej.omero.DefaultOMEROService.downloadImage(DefaultOMEROService.java:515)
	at net.imagej.omero.commands.OpenFromOMERO.run(OpenFromOMERO.java:91)
	at org.scijava.command.CommandModule.run(CommandModule.java:199)
	at org.scijava.module.ModuleRunner.run(ModuleRunner.java:168)
	at org.scijava.module.ModuleRunner.call(ModuleRunner.java:127)
	at org.scijava.module.ModuleRunner.call(ModuleRunner.java:66)
	at org.scijava.thread.DefaultThreadService$3.call(DefaultThreadService.java:238)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Caused by: io.scif.img.ImgIOException: java.io.IOException: io.scif.FormatException: Error communicating with OMERO -- server version mismatch?
	at io.scif.img.ImgOpener.createReader(ImgOpener.java:426)
	at io.scif.img.ImgOpener.openImgs(ImgOpener.java:143)
	at io.scif.services.DefaultDatasetIOService.open(DefaultDatasetIOService.java:125)
	... 11 more
Caused by: java.io.IOException: io.scif.FormatException: Error communicating with OMERO -- server version mismatch?
	at io.scif.AbstractReader.setSource(AbstractReader.java:273)
	at io.scif.services.DefaultInitializeService.initializeReader(DefaultInitializeService.java:89)
	at io.scif.img.ImgOpener.createReader(ImgOpener.java:417)
	... 13 more
Caused by: io.scif.FormatException: Error communicating with OMERO -- server version mismatch?
	at net.imagej.omero.OMEROFormat.versionException(OMEROFormat.java:883)
	at net.imagej.omero.OMEROFormat.access$400(OMEROFormat.java:97)
	at net.imagej.omero.OMEROFormat$Parser.typedParse(OMEROFormat.java:452)
	at net.imagej.omero.OMEROFormat$Parser.typedParse(OMEROFormat.java:424)
	at io.scif.AbstractParser.parse(AbstractParser.java:252)
	at io.scif.AbstractParser.parse(AbstractParser.java:335)
	at io.scif.AbstractParser.parse(AbstractParser.java:51)
	at io.scif.AbstractReader.setSource(AbstractReader.java:269)
	... 15 more
Caused by: Ice.ConnectionLostException
    error = 0
	at IceInternal.AsyncResultI.__wait(AsyncResultI.java:276)
	at omero.api.ServiceFactoryPrxHelper.end_getContainerService(ServiceFactoryPrxHelper.java:2835)
	at omero.api.ServiceFactoryPrxHelper.getContainerService(ServiceFactoryPrxHelper.java:2726)
	at omero.api.ServiceFactoryPrxHelper.getContainerService(ServiceFactoryPrxHelper.java:2713)
	at net.imagej.omero.DefaultOMEROSession.loadImage(DefaultOMEROSession.java:198)
	at net.imagej.omero.DefaultOMEROSession.loadPixelsID(DefaultOMEROSession.java:216)
	at net.imagej.omero.DefaultOMEROSession.loadPixels(DefaultOMEROSession.java:177)
	at net.imagej.omero.OMEROFormat$Parser.typedParse(OMEROFormat.java:445)
	... 20 more

To reproduce, download an image from OMERO, close it, wait >10 minutes, then try downloading it again.