Hi Greg,
i found something i cant investigate by myself.
Maybe you or anybody else has an answer, please ?
While trying to build an AT5 from 
download.geofabrik.de/europe/czech-republic-latest.osm.pbf
Only adjusting the IMC to ATLAS10 and Project Based Naming,
The IMC 0.7.2.0 crashes with an Exception Error.
Heres the log i am able to see before it crashes.
19:55:47> Cleaning up work folder
19:55:47> Reading in and Altering Definition Library
19:55:47> Kept Display Definition: 0
19:55:47> Clipping - Starting
19:55:47> Clipping: czech-republic-latest.osm.pbf
19:55:47> Parsing file and storing block information
19:56:05> Blocks: 5423 Node Blocks: 4825 Way Blocks: 592 Rel Blocks: 8
19:56:05> Processing and Clipping Blocks
19:56:31> WARNING: Recombined polygon ring does not begin and end on the same point
20:09:39> WARNING: OSM Relation references unspecified way
20:09:39> WARNING: OSM Relation references unspecified relation
20:11:44> Generating and Clipping Ocean Polygon
20:11:44> Generating Reset Polygon
20:11:44> Generating Highway Shields
20:11:48> Declutter Time (3314 ms); Total Points (433810)
20:11:50> Generating City Names
20:11:50> Declutter Time (124 ms); Total Points (17646)
20:11:50> Closing and finalizing writers in output cache.
20:11:50> Clipping - Complete
20:11:50> Generating UnboundAT5s - Starting
20:11:50> Processing Folder: Large
20:11:50> Discovering Files
20:11:50> Processing Files
20:11:50> Major Block: A240040 : Processing
20:11:50> Major Block: A240040 : Writing
20:11:50> Major Block: A260040 : Processing
20:11:51> WARNING: (Version Specific Warning) Line Info Box Support Not Available Until Atlas Version 13.  Nullifying Info Box.
20:11:51> WARNING: (Version Specific Warning) Polygon Info Box Support Not Available Until Atlas Version 13.  Nullifying Info Box.
20:12:06> Major Block: A260040 : Writing
20:12:08> Major Block: A240060 : Processing
20:12:24> Major Block: A240060 : Writing
20:12:25> Major Block: A260060 : Processing
20:17:18> Major Block: A260060 : Writing
20:17:45> Major Block: A240080 : Processing
20:17:46> Major Block: A240080 : Writing
20:17:46> Major Block: A260080 : Processing
20:18:45> Major Block: A260080 : Writing
20:18:50> Processing Folder: Medium
20:18:50> Discovering Files
20:18:50> Processing Files
20:18:50> Major Block: A020000 : Processing
There a a few more, maybe 2 or 4 Messages, which i was not able to catch after the Exception Error comes up.
So after this error in 32/64Bit Ver. of 0.7.2.0 i tried the 0.6.6. IMC.
Then i am wondering, because the 0.6.6. was building the Map without an crash.
So i believe it has nothing to do with the Data !?
Here is the Log from the 0.6.6. build process:
21:00:05> Cleaning up work folder
21:00:05> Reading in and Altering Definition Library
21:00:05> Kept Display Definition: 0
21:00:05> Clipping - Starting
21:00:05> Clipping: czech-republic-latest.osm.pbf
21:00:05> Parsing file and storing block information
21:00:22> Blocks: 5423 Node Blocks: 4825 Way Blocks: 592 Rel Blocks: 8
21:00:22> Processing and Clipping Blocks
21:00:47> WARNING: Recombined polygon ring does not begin and end on the same point
21:13:09> WARNING: OSM Relation references unspecified way
21:13:09> WARNING: OSM Relation references unspecified relation
21:15:10> Generating and Clipping Ocean Polygon
21:15:10> Generating Reset Polygon
21:15:10> Generating Highway Shields
21:15:15> Declutter Time (5037 ms); Total Points (433810)
21:15:17> Generating City Names
21:15:17> Declutter Time (201 ms); Total Points (17646)
21:15:18> Closing and finalizing writers in output cache.
21:15:18> Clipping - Complete
21:15:18> Generating UnboundAT5s - Starting
21:15:18> Processing Folder: Large
21:15:18> Discovering Files
21:15:18> Processing Files
21:15:18> Major Block: A240040 : Processing
21:15:18> Major Block: A240040 : Writing
21:15:18> Major Block: A260040 : Processing
21:15:32> Major Block: A260040 : Writing
21:15:34> Major Block: A240060 : Processing
21:15:47> Major Block: A240060 : Writing
21:15:49> Major Block: A260060 : Processing
21:20:03> Major Block: A260060 : Writing
21:20:34> Major Block: A240080 : Processing
21:20:35> Major Block: A240080 : Writing
21:20:35> Major Block: A260080 : Processing
21:21:27> Major Block: A260080 : Writing
21:21:32> Processing Folder: Medium
21:21:32> Discovering Files
21:21:32> Processing Files
21:21:32> Major Block: A020000 : Processing
21:21:59> Major Block: A020000 : Writing
21:22:01> Processing Folder: Small
21:22:01> Discovering Files
21:22:01> Processing Files
21:22:01> Major Block: A000000 : Processing
21:22:08> Major Block: A000000 : Writing
21:22:08> Generating UnboundAT5s - Complete
21:22:08> Generating BoundAT5s - Starting
21:22:08> Major Block: A260060 : Merging
21:25:07> Major Block: A260080 : Merging
21:25:40> Major Block: A260040 : Merging
21:25:51> Major Block: A240060 : Merging
21:26:01> Major Block: A240080 : Merging
21:26:02> Major Block: A240040 : Merging
21:26:38> Major Block: A020000 : Merging
21:26:55> Major Block: A000000 : Merging
21:26:55> Generating BoundAT5s - Complete
21:26:55> Cleaning up work folder
21:26:55> Process Complete!
 
In Hope to get some Help, thank you.
bye