Hi Bernward, > A bug I reported some time ago seems not to be fixed in netcdf-2.4-beta1: > The following test program stops with "ncattput: extend_array: Invalid > argument" Are you sure you are linking against the new version of the netCDF library? The test program you sent works fine here when linked against the 2.4-beta library on a SPARCstation/SunOS 5.4 platform. It appears that this bug wasn't mentioned in the list of fixes, but it appears it was fixed, unless it only occurs on a specific platform. What OS and compiler were you using? --Russ