Have you experienced a bug with T6 solo dungeons?
This is not a bug but intended in the new changes.
Basically what is happening is this: Green and blue portals have been drastically reduced in frequency. And when I say drastically think 15x. Portals can take a day or more to respawn rather than respawning repeatedly every hour or so. This means its actually rare to see a green/blue portal up.
The miniboss will only appear if the portal is up. So be prepared to not encounter a miniboss the majority of the time as portals are very rare to find now.
Please remember that if you see a portal but no miniboss, this means that another person or group has entered the portal but not completely filled the maximum number the portal can hold. So if you clear to a miniboss and find it missing, but there is a portal glowing there then it means someone has already killed the miniboss and entered the portal. And you can no longer enter it because you are not in his group. The portal will remain if 1 person enters a green portal (which can hold up to 2 people), or 4 or less people enter a blue portal (which can hold up to 5 people).
During the test server many of us noticed this change. So basically you can no longer stay permanently in a portal, redoing it again and again. Now if you do a green portal in a dungeon solo, then you can expect there to be no more green portals for a good 20 hours plus in that dungeon.
This means that people can't just avoid the danger of a dungeon and reap the benefits of the increased fame/albion silver drops you find in a red/black zone. And it also reduces china farmers and other players who would rather stay in an instance the whole game rather than interact with others. Personally I love the change because it forces people into the open world and no longer caters to players who want to avoid others in complete safety.
ALSO: please note that even if you are in a yellow zone and enter a green portal, these mobs will execute you in the event of death. So Dying in a portal means you will lose all your gear. No longer are they forgiving to players as they were before.
Hope this answers your question.

Aug
Albion Online Feedback and Thoughts
I get the feeling Albion Online is not the game I was sold it to be. It may once have been, or at least the idea to be a GvG/PvP game, but along the way two realizations must have hit

Aug
I suggested that instead of making albion gear able to be looted
Think of a match making system where you could either queue as a group or as a solo. Your matched against another team w/ people based upon a mean-average of items totals (So you're not queuing as a T4.2 going against T6.3s)

Aug
Albion Online Virtual currency Inflation
The wrost thing hard core pvp'er actually do is cripple the economy growth when a game is new their impatience is actually turning people away from pvp in the long term because the risk is much higher than the gain

Jul
The AlbionMall Internet Game Exchange: How It Works
Because AlbionMall is a premium internet game exchanger, they can guarantee all albion silver and items sold at their website to be safe and worry-free.

Oct
In the albion current beta Learning Points was made too strong
As to Learning Points there is a drastic nerf that is going to be comming to it that will hopefully make the economy better.

Sep
The OP's questions hit the crux of the problem with Albion Online
Don't worry about specializing in anything yet, never use LP for that anyway. That will come eventually as you realize exactly what type of gear and weapon you want to use and craft.