If you’re seeing watermarks on some machines but not on others, there’s usually a simple explanation: those machines cannot connect to the license server. The first thing you should do is check the RLM diagnostics on the license server. In particular, look for the solidangle Statistics, which will show you whether or not licenses are being denied. For example:

solidangle Statistics --- Since Start --- Since Midnight --- Recent ---
    Start time          03/29 18:40:20    04/01 00:00:24   04/01 12:41:30
    Messages:        39398 (   0/sec)   7755 (   0/sec)    20 (   0/sec)
    Connections:      4874 (   0/sec)   1073 (   0/sec)     4 (   0/sec)
    Checkouts:        4844 (   0/sec)   1050 (   0/sec)     3 (   0/sec)
    Denials:             0 (   0/sec)      0 (   0/sec)     0 (   0/sec)
    License removals:    0 (   0/sec)      0 (   0/sec)     0 (   0/sec)

More here…