GRF Disabled after loading savegame

[jimrob]

I have an odd problem I can't seem to solve. When loading a saved game, I am greeted with "invalid train length" errors and disabled GRF files. Here's what I have:

Combined North American Signals 1.1
Generic Tram Set 0.4
Industrial Stations Renewal 0.8.0
Multi-Storey Car Park
New Transmitter for TTD
Oil-Fired Power Station
US Stations Set 0.86
US Town Names 0.31
US Train Set 0.87.4 (disabled)
Water Treatment Plant (disabled)

The climate seems to make no difference; I've had this problem both in the mountainous and desert climates. When I initially start the game, there are no problems. Its only on loading a saved game that the GRF files are disabled.

Anyone know what I'm doing wrong here?

-- edit --

I'm using version OpenTTD v0.6.3 in Debian Etch

[Rubidium]

0.6.3 is more strict about NewGRFs doing invalid things (according to the specifications). Most likely your issues are caused by the extra strictness. As I don't have the exact NewGRFs you have I can't tell for sure.

[jimrob]

My mistake - I was sharing savegames between two Linux boxes. I updated one from 0.62 to 0.63 and left the other at 0.62.