Why can't files be locked in AFP home directories?

Hello!
Our setup: Lion Server on Mac Pro with 30 Lion clients.
Several applications, notable Eclipse and R Studio, are crashing on start and complaining about not being able to lock files in their working directories. This only happens on network accounts whose home directories are on the server, not local accounts on the clients.
These apps worked fine under Snow Leopard.
I have three questions:
1. I assume this is a more low-level type of locking than the "Locked" checkbox in Get Info: am I right?
2. Could apps running on clients (logged into network accounts) get locks in Snow Leopard?
3. If so, what's changed in Lion, and how can I re-enable locking?
Thanks
Louise
Example error from R Studio:
12 Jun 2012 18:24:23 [rsession-fintannagle] ERROR system error 45 (Operation not supported) [lock-file=/Network/Servers/xgrid.complex.ucl.ac.uk/Volumes/Users/fintannagle/. rstudio-desktop/sdb/s-333EABAB/lock_file]; OCCURRED AT: core::Error core::FileLock::acquire(const core::FilePath&) /Users/rstudio/rstudio/src/cpp/core/FileLock.cpp:117; LOGGED FROM: bool session::source_database::supervisor::<unnamed>::reclaimOrphanedSession(const std::vector<core::FilePath, std::allocator<core::FilePath> >&, core::FilePath*) /Users/rstudio/rstudio/src/cpp/session/SessionSourceDatabaseSupervisor.cpp:249
12 Jun 2012 18:24:23 [rsession-fintannagle] ERROR system error 45 (Operation not supported) [lock-file=/Network/Servers/xgrid.complex.ucl.ac.uk/Volumes/Users/fintannagle/. rstudio-desktop/sdb/s-505698E8/lock_file]; OCCURRED AT: static bool core::FileLock::isLocked(const core::FilePath&) /Users/rstudio/rstudio/src/cpp/core/FileLock.cpp:61; LOGGED FROM: static bool core::FileLock::isLocked(const core::FilePath&) /Users/rstudio/rstudio/src/cpp/core/FileLock.cpp:63
12 Jun 2012 18:24:23 [rsession-fintannagle] ERROR system error 45 (Operation not supported) [lock-file=/Network/Servers/xgrid.complex.ucl.ac.uk/Volumes/Users/fintannagle/. rstudio-desktop/sdb/s-505698E8/lock_file]; OCCURRED AT: core::Error core::FileLock::acquire(const core::FilePath&) /Users/rstudio/rstudio/src/cpp/core/FileLock.cpp:117; LOGGED FROM: bool session::source_database::supervisor::<unnamed>::reclaimOrphanedSession(const std::vector<core::FilePath, std::allocator<core::FilePath> >&, core::FilePath*) /Users/rstudio/rstudio/src/cpp/session/SessionSourceDatabaseSupervisor.cpp:249

User presets and templates will only be placed within the catalog folder after the 'Store presets with catalog' is activated. Existing user presets and templates will remain in their original location. I appreciate that this is a tad confusing, but it's the way Lr works. To get all of your existing presets and templates into the catalog folder it's probably quicker and easier to just copy the entire 'Lightroom Settings' folder from the default location to the Lightroom catalog folder.

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