Permission denied error from time to time when using Selenium API

[Lior]

*Hi,*
*From time to time we get exception/s related to Permission Denied when first starting Selenium Server and Client. The issue occurs without a specific logic so we can't catch the pattern to understand what causes these errors.*
*This is the exception/s we recieve:*

{font:style=font-family: "Verdana","sans-serif"; color: green;}com.thoughtworks.selenium.SeleniumException: ERROR: Command execution failure. Please search the forum at [http://clearspace.openqa.org] for error details from the log window. The error message is: Permission denied{font}

+{font:style=font-size: 12pt; font-family: "Verdana","sans-serif"; color: green;}com.thoughtworks.selenium.SeleniumException: ERROR: Command execution failure. Please search the forum at http://clearspace.openqa.org for error details from the log window.  The error message is: Object required         at com.thoughtworks.selenium.HttpCommandProcessor.throwAssertionFailureExceptionOrError(HttpCommandProcessor.java:97)         at com.thoughtworks.selenium.HttpCommandProcessor.doCommand(HttpCommandProcessor.java:91)         at com.thoughtworks.selenium.HttpCommandProcessor.getString(HttpCommandProcessor.java:262)         at com.thoughtworks.selenium.HttpCommandProcessor.getBoolean(HttpCommandProcessor.java:335)         at com.thoughtworks.selenium.DefaultSelenium.isTextPresent(DefaultSelenium.java:491){font}+

*Any thoughts?*
*Lior*