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Im running the TDS with the aggregation (no recheckEvery attribute). Im using the dods://localhost:8080/thredds/dodsC/data/cip/fmrcCase1/CIPFMRCCase1_best.ncd dataset, and successfully looping over levels and times. I am noticing some wierdness in the handling of the name "Latitude_-90_to_+90". opendap has a known bug in handling "-". Can you change the name to something without special chars like - and + ? Also: 1) try using the development version of ToolsUI if youre not already. 2) find the actual exception dump in the console and send it over. I tries to reproduce your access in the code: public void testFMRCSubset() throws Exception { GridDataset dataset = GridDataset.open("dods://localhost:8080/thredds/dodsC/data/cip/fmrcCase1/CIPFMRCCase1_best.ncd"); GeoGrid grid = dataset.findGridByName("Latitude__90_to_+90"); assert null != grid; GridCoordSystem gcs = grid.getCoordinateSystem(); assert null != gcs; Range timeRange = new Range( 2, 2 ); int bestZIndex = 5; GeoGrid subset = grid.subset( timeRange, new Range( bestZIndex, bestZIndex ), null, null ); Array yxData = subset.readYXData( 0, 0 ); NCdump.printArray(yxData, "xyData", System.out, null); dataset.close(); } 1) If you can, find out exactly which time and z coordinate you have. 2) Which lien is throwing the exception? geoGrid.readYXData( 0, 0 ) ? Ticket Details =================== Ticket ID: XBA-228331 Department: Support THREDDS Priority: Normal Status: Open