Hi, I created a root file (mainly a TTree with severa branches) on a linux-i386 machine with a custom program using ROOT libs. (Linux 2.2.13-22mdk #1 SMP Fri Oct 22 02:06:33 CEST 1999 i686 unknown) ROOT version is 2.25.03 Then I read it through an NFS access from an ALPHA station from a custom programm using ROOT version 2.25.01. (OSF1 gandus1.in2p3.fr V5.0 910 alpha) I got : Error in <TBuffer::ReadObject>: object tag too large, I/O buffer corrupted Error in <TBuffer::ReadObject>: object tag too large, I/O buffer corrupted Error in <TBuffer::ReadClass>: illegal class tag=569376767 (0<tag<=2), I/O buffer corrupted As far as I can see from GDB, the problem occurs outside of my own code. Moreover, the *same* source compile and run on the linux machine without any problem. UPDATE: Same errors occur i I copy the file localy on the ALPHA machine and open it through a 'TBrowser' from inside the root programm. Shouldnt different minor versions numbers of root file be compatible ? Yannick
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