Thanks for the answer - a disaster again (and a real one, I am about to give a short workshop today on OpenRefine in a wintershcool and all of my data is missing...
I suppose it has to do with windows onedrive soft and hard links in OneDrive which I was not aware to.
07:05:50.518 [ refine_server] Starting Server bound to '
127.0.0.1:3333' (0ms)
07:05:50.530 [ refine_server] Initializing context: '/' from 'C:\Users\yaeln\OneDrive\Desktop\openrefine-3.3\webapp' (12ms)
07:05:51.083 [ refine_server] Failed to use jdatapath to detect user data path: resorting to environment variables (553ms)
07:05:51.084 [ refine_server] Creating new workspace directory C:\Users\yaeln\AppData\Roaming\OpenRefine (1ms)
07:05:51.084 [ refine_server] Failed to use jdatapath to detect user data path: resorting to environment variables (0ms)
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/C:/Users/yaeln/OneDrive/Desktop/openrefine-3.3/server/target/lib/slf4j-log4j12-1.7.18.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/C:/Users/yaeln/OneDrive/Desktop/openrefine-3.3/webapp/WEB-INF/lib/slf4j-log4j12-1.7.18.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See
http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
07:05:51.291 [ refine] Starting OpenRefine 3.3 [58b839b]... (207ms)
07:05:51.291 [ refine] initializing FileProjectManager with dir (0ms)
07:05:51.292 [ refine] C:\Users\yaeln\AppData\Roaming\OpenRefine (1ms)
07:05:51.301 [ FileProjectManager] Failed to load workspace from any attempted alternatives. (9ms)
07:05:57