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. Here's an example from a real-life rlmdiag.txt file:

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)

Now that you see that there are no license denials, you can move on to testing the connections from the client machines to the license server.

To get the RLM diagnostics and the solidangle Statistics, you can use the RLM Web Admin: open a web browser and go to localhost:5054 (if you're sitting at the license server computer) or <lic-server-name-or-ip>:5054 if you're sitting at another machine.

You can also use the rlmutil command line:

C:\Program Files\RLM>rlmutil rlmstat -a
rlmutil v10.1
Copyright (C) 2006-2013, Reprise Software, Inc. All rights reserved.

        rlm status on localhost (port 5053), up 3d 04:04:48
        rlm software version v11.1 (build:2)
        rlm comm version: v1.2
        Startup time: Fri Jul 18 14:05:13 2014
        Todays Statistics (18:09:52), init time: Mon Jul 21 00:00:09 2014
        Recent Statistics (00:22:23), init time: Mon Jul 21 17:47:38 2014
                     Recent Stats         Todays Stats         Total Stats
                      00:22:23             18:09:52          3d 04:04:48
        Messages:    9 (0/sec)           35 (0/sec)          52 (0/sec)
        Connections: 5 (0/sec)           31 (0/sec)          48 (0/sec)
        --------- ISV servers ----------
           Name           Port Running Restarts
        solidangle       64920   Yes      0
        ------------------------
        solidangle ISV server status on localhost (port 64920), up 3d 04:04:48
        solidangle software version v11.1 (build: 2)
        solidangle comm version: v1.2
        solidangle Debug log filename: <stdout>
        solidangle Report log filename: <stdout>
        Startup time: Fri Jul 18 14:05:13 2014
        Todays Statistics (18:10:00), init time: Mon Jul 21 00:00:01 2014
        Recent Statistics (00:28:36), init time: Mon Jul 21 17:41:25 2014
                     Recent Stats         Todays Stats         Total Stats
                      00:28:36             18:10:00          3d 04:04:48
        Messages:    4 (0/sec)           1819 (0/sec)          8764 (0/sec)
        Connections: 2 (0/sec)           29 (0/sec)          48 (0/sec)
        Checkouts:   0 (0/sec)           26 (0/sec)          43 (0/sec)
        Denials:     0 (0/sec)           0 (0/sec)          0 (0/sec)
        Removals:    0 (0/sec)           0 (0/sec)          0 (0/sec)

        ------------------------
        solidangle license pool status on localhost (port 64920)
        arnold v20151030
                count: 5, # reservations: 0, inuse: 0, exp: 25-apr-2018
                obsolete: 0, min_remove: 120, transactions: 43
        arnold v20141030
                count: 5, # reservations: 0, inuse: 0, exp: 30-oct-2016
                obsolete: 0, min_remove: 120, transactions: 0
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