I'm having this exact problem right now.  I had 2 transactions worth over $1000 worth of Litecoin that were sent out of my Jaxx Wallet and never made it to the Blockchain.  When you search the transaction number provided by the Jaxx Wallet it says "Not Found".  And under Block Number it says "none".  The transactions have been deducted from my balance.  I tried refreshing the cache.  And I have seen the 2 transactions come back into the Wallet briefly, but then a few minutes later they are sent back out again to somewhere in Limbo.  Jaxx Support has not helped me for 3 days.  Did you ever find a solution to this?  I still have my private keys and I'm thinking of importing them to the official Litecoin Wallet and see if my funds come back in there.  But unsure if I should do that or wait for Jaxx Support to respond.