No WCF request is sent from Silverlight on client machine -

my sl application commercial , working fine on hundreds of machines.

sl using wcf service , works expected, today observed behavior on client machine, literally no call made server.

after click button sends call, error occures, , no record wcf call created in fiddler.

error is:

[httpwebrequest_webexception_remoteserver] arguments: notfound debugging resource strings unavailable... 

i read error people recommend use fiddler, there no call displayed in fiddler

so problem worse thought initially.

it comes , goes. have found working solution fixes problem after appears although doesn't make sense me.

for example if error in chrome & mozilla & oob version, launching program in ie works, , after chrome,mozilla & oob start work too.

thing same people had problem solved workaround experience again in days, week, no apparent reason, , combination of launches various locations helps (usually ie helps most).

any appreciated, start bounty pretty sick bug , need fix somehow.

update

weird ie fix scenario:

at point oob version gets state doesn't send wcf request server. (fiddler doesn't see it, server doesn't gets it). after launching web version in ie, , hitting same button, sends wcf request desired result in ie web version.

without changing else, relaunching oob version in buggest state before, makes oob version work correctly. not reinstalled, not changed - nothing.

this call "ie cure" of problem. question can ie launch potentiall change oob version?

according this thread message debugging resources unavailable appears when de client not using the silverlight developer runtime.

this means actual exception hidden (and us) next step reproduce error on system has silverlight developer runtime.

i found this article. might worth check certificate using (are using certificate) 1 of things different oob apps , browsers.