Hello, under W10 ,32 GB RAM, Ryzen 7- 8 Core, mkgmap-r4919 (and also previous versions) stops processing large data sets after about 600 tiles. That's why I installed an UBUNTU 22-04 system. And the java-1.11.0-openjdk, installs jdk-21-oracle-x64 and jdk-22-oracle-x64 machines. None of the JVM works. On java-1.11.0, Ubuntu crashes completely after starting mkgamp. Under jdk-21, mkgmap creates ~40 tiles and the terminal exits. Under jdk-22 mkgmap creates ~40 tiles and the terminal closes. Which JVM on UBUNTU needs to be installed to fix this error? Under Windows 10, the generation ends after ~ 600 tiles from 1215 tiles. Why? What do you have to set up on W10 to make mkgmap work to the end ? Half a year ago, this went without any problems. Now it doesn't work on W10 or Linux. Hints very welcome. thomas